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/*
* ks8695eth.c -- KS8695 ethernet driver
*
* (C) Copyright 2004-2005, Greg Ungerer <greg.ungerer@opengear.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/****************************************************************************/
#include <common.h>
#include <malloc.h>
#include <net.h>
#include <asm/io.h>
#include <asm/arch/platform.h>
/****************************************************************************/
/*
* Hardware register access to the KS8695 LAN ethernet port
* (well, it is the 4 port switch really).
*/
#define ks8695_read(a) *((volatile unsigned long *) (KS8695_IO_BASE + (a)))
#define ks8695_write(a,v) *((volatile unsigned long *) (KS8695_IO_BASE + (a))) = (v)
/****************************************************************************/
/*
* Define the descriptor in-memory data structures.
*/
struct ks8695_txdesc {
uint32_t owner;
uint32_t ctrl;
uint32_t addr;
uint32_t next;
};
struct ks8695_rxdesc {
uint32_t status;
uint32_t ctrl;
uint32_t addr;
uint32_t next;
};
/****************************************************************************/
/*
* Allocate local data structures to use for receiving and sending
* packets. Just to keep it all nice and simple.
*/
#define TXDESCS 4
#define RXDESCS 4
#define BUFSIZE 2048
volatile struct ks8695_txdesc ks8695_tx[TXDESCS] __attribute__((aligned(256)));
volatile struct ks8695_rxdesc ks8695_rx[RXDESCS] __attribute__((aligned(256)));
volatile uint8_t ks8695_bufs[BUFSIZE*(TXDESCS+RXDESCS)] __attribute__((aligned(2048)));;
/****************************************************************************/
/*
* Ideally we want to use the MAC address stored in flash.
* But we do some sanity checks in case they are not present
* first.
*/
unsigned char eth_mac[] = {
0x00, 0x13, 0xc6, 0x00, 0x00, 0x00
};
void ks8695_getmac(void)
{
unsigned char *fp;
int i;
/* Check if flash MAC is valid */
fp = (unsigned char *) 0x0201c000;
for (i = 0; (i < 6); i++) {
if ((fp[i] != 0) && (fp[i] != 0xff))
break;
}
/* If we found a valid looking MAC address then use it */
if (i < 6)
memcpy(ð_mac[0], fp, 6);
}
/****************************************************************************/
static int ks8695_eth_init(struct eth_device *dev, bd_t *bd)
{
int i;
debug ("%s(%d): eth_reset()\n", __FILE__, __LINE__);
/* Reset the ethernet engines first */
ks8695_write(KS8695_LAN_DMA_TX, 0x80000000);
ks8695_write(KS8695_LAN_DMA_RX, 0x80000000);
ks8695_getmac();
/* Set MAC address */
ks8695_write(KS8695_LAN_MAC_LOW, (eth_mac[5] | (eth_mac[4] << 8) |
(eth_mac[3] << 16) | (eth_mac[2] << 24)));
ks8695_write(KS8695_LAN_MAC_HIGH, (eth_mac[1] | (eth_mac[0] << 8)));
/* Turn the 4 port switch on */
i = ks8695_read(KS8695_SWITCH_CTRL0);
ks8695_write(KS8695_SWITCH_CTRL0, (i | 0x1));
/* ks8695_write(KS8695_WAN_CONTROL, 0x3f000066); */
/* Initialize descriptor rings */
for (i = 0; (i < TXDESCS); i++) {
ks8695_tx[i].owner = 0;
ks8695_tx[i].ctrl = 0;
ks8695_tx[i].addr = (uint32_t) &ks8695_bufs[i*BUFSIZE];
ks8695_tx[i].next = (uint32_t) &ks8695_tx[i+1];
}
ks8695_tx[TXDESCS-1].ctrl = 0x02000000;
ks8695_tx[TXDESCS-1].next = (uint32_t) &ks8695_tx[0];
for (i = 0; (i < RXDESCS); i++) {
ks8695_rx[i].status = 0x80000000;
ks8695_rx[i].ctrl = BUFSIZE - 4;
ks8695_rx[i].addr = (uint32_t) &ks8695_bufs[(i+TXDESCS)*BUFSIZE];
ks8695_rx[i].next = (uint32_t) &ks8695_rx[i+1];
}
ks8695_rx[RXDESCS-1].ctrl |= 0x00080000;
ks8695_rx[RXDESCS-1].next = (uint32_t) &ks8695_rx[0];
/* The KS8695 is pretty slow reseting the ethernets... */
udelay(2000000);
/* Enable the ethernet engine */
ks8695_write(KS8695_LAN_TX_LIST, (uint32_t) &ks8695_tx[0]);
ks8695_write(KS8695_LAN_RX_LIST, (uint32_t) &ks8695_rx[0]);
ks8695_write(KS8695_LAN_DMA_TX, 0x3);
ks8695_write(KS8695_LAN_DMA_RX, 0x71);
ks8695_write(KS8695_LAN_DMA_RX_START, 0x1);
printf("KS8695 ETHERNET: %pM\n", eth_mac);
return 0;
}
/****************************************************************************/
static void ks8695_eth_halt(struct eth_device *dev)
{
debug ("%s(%d): eth_halt()\n", __FILE__, __LINE__);
/* Reset the ethernet engines */
ks8695_write(KS8695_LAN_DMA_TX, 0x80000000);
ks8695_write(KS8695_LAN_DMA_RX, 0x80000000);
}
/****************************************************************************/
static int ks8695_eth_recv(struct eth_device *dev)
{
volatile struct ks8695_rxdesc *dp;
int i, len = 0;
debug ("%s(%d): eth_rx()\n", __FILE__, __LINE__);
for (i = 0; (i < RXDESCS); i++) {
dp= &ks8695_rx[i];
if ((dp->status & 0x80000000) == 0) {
len = (dp->status & 0x7ff) - 4;
NetReceive((void *) dp->addr, len);
dp->status = 0x80000000;
ks8695_write(KS8695_LAN_DMA_RX_START, 0x1);
break;
}
}
return len;
}
/****************************************************************************/
static int ks8695_eth_send(struct eth_device *dev, void *packet, int len)
{
volatile struct ks8695_txdesc *dp;
static int next = 0;
debug ("%s(%d): eth_send(packet=%p,len=%d)\n", __FILE__, __LINE__,
packet, len);
dp = &ks8695_tx[next];
memcpy((void *) dp->addr, (void *) packet, len);
if (len < 64) {
memset((void *) (dp->addr + len), 0, 64-len);
len = 64;
}
dp->ctrl = len | 0xe0000000;
dp->owner = 0x80000000;
ks8695_write(KS8695_LAN_DMA_TX, 0x3);
ks8695_write(KS8695_LAN_DMA_TX_START, 0x1);
if (++next >= TXDESCS)
next = 0;
return 0;
}
/****************************************************************************/
int ks8695_eth_initialize(void)
{
struct eth_device *dev;
dev = malloc(sizeof(*dev));
if (dev == NULL)
return -1;
memset(dev, 0, sizeof(*dev));
dev->iobase = KS8695_IO_BASE + KS8695_LAN_DMA_TX;
dev->init = ks8695_eth_init;
dev->halt = ks8695_eth_halt;
dev->send = ks8695_eth_send;
dev->recv = ks8695_eth_recv;
strcpy(dev->name, "ks8695eth");
eth_register(dev);
return 0;
}
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